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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109f1deb19ce4fbeaa2693704f5989d00c942ff639d3fb3d3374862cee8687bd' 
  AND token = 'ja0iLQ2tv42FUcxsHVA/4u8yAi1uU8NmFY3PZVXeFp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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