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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a9907fea74f67b6ead032522bc573e7e4c21d88ad07ebe6a94f29baaf37ee4' 
  AND token = '408YjlVQkaV2oRfrQrDjFDnZB0nq1T5FTtwaWyJdD5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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