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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f661d62a4b0e735d9128edbefdd979860f499ddc0d494e12cf5900f9fa59a9' 
  AND token = 'Twvxtgo20kRRjDUsrqGOpPhflJedD0bpoE0YQ9R5Bv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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