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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6682648d5b268badb4ff24834b3c371ee598979b089e15d593ca415b5ad5ae4e' 
  AND token = 'iMV6J4obdp6eFbkcL9cTTGU4u07W9TLBkTQcpRmbOYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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