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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a00d6a776b9481ee8d6709b299d9be9b0a85a3295e0f23d53da63726f5557e' 
  AND token = 'otGU/IEvMNvFB0fF2TpWOAd2sC82QHMU0hAVGCuzwnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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