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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732231d3c6f743df9d862509cd70c814f0a997a80d610624956762d8dd016185' 
  AND token = 'VnJPFW8KYFc0u2767OlADBdfSkE77AZ22Es0R527wDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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