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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2525e6f5219c6bf02f84178ef847f146b97d4c60c4fe8bbf38c9a0661c37d548' 
  AND token = 'GIOBPyEi08EJpKmCfnjKVlRl851tblVd0woENY6arL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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