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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7116a3b3f281b8c73d8c1ea974a824e0877ed790ae0a707f960d2ccd0c7ca6ea' 
  AND token = '/51YZD1zpvQDVu0b9PCfscKUqEYUX4Geuyf5NZRxfYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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