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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6cc9b206ca5356b9a7ce9846d003b77c9e70f5a0a759ecc962f9e50c055497' 
  AND token = 'ww7Mvrsbxb5vDwEq/KPM3VhrIali/vw7eTSGRcWpBCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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