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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a55b45003797d744ed59732495f2f88fd43fb469569bde75086c4a57ae92580' 
  AND token = 'lv7AbhwfD0YdbcYyAXT5PRP3Yuufa/8Jy/LnD7gehAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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