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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec98b7ad4d2ba7a22e7cef90cf0e5bd953a91bfbadebb486a3f39efa5f991e2f' 
  AND token = 'GBUnyTLe+qPtzNS5VyFiYdghXbZX1U3uwj41hShAQGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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