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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5924bfb895b8472cbe4ae8545d9ab7a1d17b284eb668ffc75984d7d76dad5482' 
  AND token = 'ctlXmoNxMpTCuw77wRenhSiPxpCdmE6+zdjeew22aOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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