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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ceea46191f6aa2bd05288e895c892bd48a8e134b02917879d7f9d155f7ebc7' 
  AND token = 'bgk793PlbHPsldy5SJB8NV72jQtidNDGgTShQOIn03I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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