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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cce79d5a9ff66e3b8d17aacaa15e1b3b508fd11e1ad3a1758a2e60f1301e7a' 
  AND token = 'Y/IenY/BHfql989Loxc2ZftOpje0LMeW+FQhzjLzit8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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