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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023c058095c5923b2ee7e87afb4bf096f69f9023f5d3f6113ad2c9cd0b4e1f6f' 
  AND token = 'p124mURLVhPtdK6kXKbCuwp3+MPR9iD3R7m57sR7Pog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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