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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22336f6ee768dc877ca36d1164c9b5fde3bebc5ca624cf56fc2507510f92eade' 
  AND token = 'xSwDpElo4O2H0BcWfIfwzgcPrY4YNVwRrFue3OSn30U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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