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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3b1220b0a2fd87c13feab227aa467747fbf7bc70d6a68e7ece7dd7879afb0c' 
  AND token = 'mCOhBwjtxtbL9PbBluqhhxTNPyRjxshK5Fxjadr/bmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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