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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1307387f7dfd9e3f7f0e10c6afdd9337b10f8fd4c7ec81f89853a9dd92096e9e' 
  AND token = 'lNfJZnAJvDY4XmZSW33fspDyc/Dtv3igAmlggGCdqNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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