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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e2210945dcd8f608ab097ee7c067a0023a3d6d69e3d748fe96c2521c2982d4' 
  AND token = '1MJjhBK2LZ8A+AR7NuytX0Pztdv6rexMTKKfFbdBNUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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