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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c1f6a89841c9edaa2bebce1963876b8f536de6bd1460044ff03eed237f7345' 
  AND token = 'ppg/ZIZcc5DxlZAEjd8owItnc5rs48Vjq5HKjbwj+Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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