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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc52cc955503c582df290d38a4fc825c68e0e5d08611c7005137748df64f12bb' 
  AND token = 'aEshhR6QVnPcsU3niC9IV6WDcv983JiERJJm8kwURN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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