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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de25e84b83a4135152bf8cfeca4bcfefd77419f343d70236712ecb8a72fff57' 
  AND token = 'IpCFUt9yNDg53ULYfsXe85uziv+SLpasEAWid1n9YG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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