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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a44a42c82db75bcaae494db36dfa59f876e66009b9742f641af22a464df6e04' 
  AND token = 'h4tc341Zt59wNhsfO9mT1kUtXL50ro8oYwESfDIk2XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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