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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b300abc3137c3de830cce069916704a083f257fee7731cdb33158f8f460b6e' 
  AND token = '4NWcwlaKgcgTHLXCfyMKpT2lX9JQ9LF3y/EeVChf0YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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