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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6854ee1a01fe9884f933910132911f83135ccfeba9874a9cbd442165f76947' 
  AND token = 'vwjTxEIIWR8AooFC4xOB1Jgj4X/3rSur37eW5URPiQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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