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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce7e05cc7469dd466166b1679434ee1a75980fc72ba041b7907bbc039d97098' 
  AND token = '6LvlhW72pWSfmqaBran51VfZuU6M55mEz08t3PJfHVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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