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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb08fdc8daa62b96d9ce22ef65dce35c6c4f562f9a7edb71b902f50921bbcc1d' 
  AND token = 'w4Qw+9/vGzWNUierW1ZXb6vkqRQ8oiTAtXR1fG1F9Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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