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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad7cfbd73c8f95db65ffa9fc4617e65845eaa30ef2b2bca07554f762c6bfc8f' 
  AND token = 'sI+rJ9o33wZrBGTg+VNSJgZbT7Pferil5FMP+XZs9co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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