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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d59acc6c9abb1df4cc2058823f4c5a8bbb1b1f0881b37c0dd8d76e476088ede' 
  AND token = 'iecQPoOo/OVPb23KaR/8FJFom7CakSdAim0DkbPIotk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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