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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbed90be433410125f655b40fcbf5916211acc1909cb8ea48dfeb696eab23284' 
  AND token = 'W5vdSEm7mq9sj30lWjnavfI3IE7jkkQNXJnwKWokPLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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