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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd138949f709b8517021ea01af51fbd3cdaea9d38a65d0226337bb223fae76bc6' 
  AND token = 'yJxbr32TYh8Zk9B+2uMNNU4l853vm/fcZ3gyJKdFAO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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