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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8fb4bd89074dce7d7dbaf64e7a90100b430596a4d192745f52d6f913c48ad0' 
  AND token = 'EwR+dD9wA3V83WFobUdoXOroAPjFSI8uzMujnGrtBas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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