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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabc33fec5401b9c29b0345f47904f4289877db9c31e8bf6d7b359bf5ff329fe' 
  AND token = 'o0IWLYUAkCoNz/tEXk75LSAar/ZxYOuf7L7q7MchlYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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