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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25dce12572be3e77d412ac14c302eb28b48f428d895e9c37624e7caceadaed66' 
  AND token = 'H0WYXtEP9hMh/2kJ5E//KS5YZzKx7nxNqMRQIDLVMJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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