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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a8890339dc58e54f194cb606af6ff0e87e3ad0d4bd38bb0a2062a2312a493e' 
  AND token = 'E7Ftxek3rsOWwmj4ZyjWswK4ktEr9pJcXSvpofrXLYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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