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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0968abac51ff21bc05fe667b402bbcf4bfa9948c4ff5739f49366d4f14f00b0a' 
  AND token = 'qjCHkV4X75Z6psPclW1GfjrV54e5FwUC1Qrllx3+w44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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