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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cd68a5707efdae34a86b01b9edc225784cc3fb32a4fb2edcb81c1ebb3ce530' 
  AND token = '5ESUWu9ycvjypLbFF9KP30fB8Y6U29ZJfQx7ONiC57E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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