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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f503a86b3b565d4d40e831111d57ed0217555c94d0c7fbf6210bfb7e87784a7' 
  AND token = 'bLnLKqIi70cLWkyT3uIvnPzpGgxspxYPjbfA5SJz60I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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