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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de591436bbab6ceb1bc29e00654fc8fb00e1f48cd3466df28b24875caf3ef5cf' 
  AND token = 'oqYuJHWoUgDppE4L/0h1rUEgflisrBr5UjbICX+dPK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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