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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f061a2e0601bd8d8e9e2eae5dc70014c5f6eed608df26ba85b61eae3bc7d93' 
  AND token = 'Z2qAYxTzry7R1TAKzDSU3RrCuS3A5kYaC2eYraLqx2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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