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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c96891cd0b803ee6937d05dbe00a0667a6a25c6d99f9e815e7c74c308eb1ac5' 
  AND token = 'aM/te3049zltFiNv3FkWYo2ddCnruGBfQUvby+MvJUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}