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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8e90a4cfbd5bde67bda5d40a287280ebafb300a9bbdcbb3623a5fe11d35935' 
  AND token = '9ZvwfVtGFRTHv4HlT8oq0ouOYdClMWx92qrtrbBbcHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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