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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f848d6aaf3e91cdccb6d8e8253c31b64bd5b2d4c7950544744844d3153c5058' 
  AND token = 'kIJTK77kPedfxyJcZvujZwJ4i5VRAifyaGJInnUJWuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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