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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90db6409f77e7cd7dc18356666b59a6b89bb1a0879fbf0f9e5b147400eebf39b' 
  AND token = 'yCoe1AJ/C2qKwTtEdT4Wh6SAwLnXA+Ne/0L9Vdd7IHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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