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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9c0b61dc4e7531e5362a6acde2c9c54c3eca4f2164edf6be10b1789912cd4e' 
  AND token = 'QdhEPSnCtP4EZTyMKpgbCID+IvoUdwfof/n44eblEHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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