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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7140deec893c52e5c2ed5971b688fd81baf21555da61439eaea3e3dfb0ce29dd' 
  AND token = 'ompbaB0RlvIqHYEO1S2Q3AusmBEd0lzP/MMJG5hprqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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