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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eba0d0f5e8296b9f8490217938123c19a009f2516473bc47c26246d06365649' 
  AND token = '0RUqoCUlkSlk7L/fGqQEnozg9RYkDzFeh7L6g172jII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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