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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69c513402ec3cce5987b965d31635f667c43873ae79d5f8eaa27d2b4fd68ea9' 
  AND token = 'HYJSIe23uH+2xpYiNByqu1UXN74BHKW1hj1ns4jU5pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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