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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640ef9106ce6f7bf3063a522b7c0a334aeffba7296db2bba64ea7884462be2cd' 
  AND token = 'riR36FuO5IScAN542eqUa3AGqihF3+Zr7CsFjEqmX5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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