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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7698506f681c0601cde42c9b85b06bcb1da097b3ab76dc96ee7dfcbd9ada26d' 
  AND token = '4X49MMHWsLIh7f6XJqNlADFP7ndnPTEgrEzaq3gCVc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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