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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81594d475c8a6eaf6f5d38d77bc2b8fe9e85621ed7e831ad95bd95359733fe9' 
  AND token = 'T6cCPPmbtswf/Lefq4LM+9QtzCJrMQ2TiWX50vfOLQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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