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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2650b2b5884c38e66446d545ee2958ff15e2000a5ec0492d79e61daede8840' 
  AND token = '89JIW5v5vcWIIV8Hu8L2GaabouMh5F14Y6TD6CofJnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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