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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32c655657dc711c574daf99c2dec12a2f85476d1d3730e3e9920ae0dfd91335' 
  AND token = 't84mHu89njMQZxtnJ4/iAWbEypgIV9iKEE69GXbmgAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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