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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123469a360b2c46e153e8dbc6009449b8dd96f5d2195272cbca338f547ef1d39' 
  AND token = 'AToU5Ag7UA1OhR5GMp0h7KH7EHXXqBYv8IUp56B0l70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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