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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba9499403f14a121b30ea1069e6c1c3afc5b4f833ce9003fe593b3590f134a8' 
  AND token = 'a4DOwLV8usbJhOUApm5Qa7HjnO8RdSbg+SZs8c732WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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