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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760c19f3f3c334824731ab70901c9afe834e8b80b3e65dea5c4e79490f759445' 
  AND token = 'lrScXayYv0milEkqnQWrx3lF23qc7FSOQDNOQFME0W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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