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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d97726902f41d3c825200c6462e506e1f4c69a2e6246e57dbe149f204670d2' 
  AND token = 'dVysotiEAjUgjtsGgz0jhLR73BwYkcg5AS1wI7qTXZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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