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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9d9518b38c89cccfbbe4fd9485a548d1843ec41e024ad0b7c4a946af8c128b' 
  AND token = 'osnV71JjXlWRiQl8DuUyXib7wSVuy7asexp1smPcIE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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