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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53392468e4722b491c07f0351e62bc46b57de6daba39a7f3bb2ff61d0062d508' 
  AND token = 'dHT9RrNL5ou6pTIpoffbcyWsy1BmIUY32tAUEZwZhqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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