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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ec0f58fc768218dde784f5f5bb96bc26f8c242de53215f49d6566951054d18' 
  AND token = 'hgF56aoAg4XFsg793Gr+nOhz0ffT4bHsuMP6m9lPHG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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