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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940f6fb02f9cfd804ad72e4a5249b1c89de684eb2459e0324c0236bb48ce2459' 
  AND token = 'cFiQV8MLvm5MB3Y9+upItA6qVM2R3rqdzCU/QJaJGkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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