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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73deb3e0cf1117dba357076366d23f58393d86874f78607c557424ce01e6d21b' 
  AND token = 'vh8nNx0c+mCrgShF3dOUrKZsnAvWAQL655cOEGNs3IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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