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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3a71e274c1f6a7852effae11550764fc4ec712c638b05da9c773d03056893f' 
  AND token = 'U1G/rZGOWuNdt8dPqOdAeyNyU2E2kP6q6ne1LM13+Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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